| Au纳米颗粒阵列中双光子吸收的饱和过程 |
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| 引用本文： | 王凯,龙华,付明,张莉超,杨光,陆培祥.Au纳米颗粒阵列中双光子吸收的饱和过程[J].物理学报,2011,60(3):34209-034209. |
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| 作者姓名： | 王凯 龙华 付明 张莉超 杨光 陆培祥 |
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| 作者单位： | 华中科技大学武汉光电国家实验室激光科学与技术研究部,武汉 430074 |
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| 基金项目： | 国家自然科学基金(批准号:60925021 and 10974062)和国家重点基础研究发展计划(批准号: 2010CB923203)资助的课题. |
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| 摘 要： | 采用纳米球蚀刻法制备了Au纳米颗粒阵列.并通过扫描电子显微镜观测了其表面形貌,表明三角形的Au纳米颗粒呈阵列状分布.采用Z扫描方法(800 nm, 50 fs)测量了Au纳米颗粒阵列的三阶非线性光学特性.在较小的激发功率下,结果呈现出双光子吸收效应,随着激发功率不断增加,出现了双光子吸收饱和的过程;非线性折射则呈现出自散焦效应.这种高效率的非线性响应机理使得该种Au纳米颗粒阵列在高速全光开关中有潜在的应用价值.
关键词：
纳米球蚀刻技术
Au纳米颗粒
三阶光学非线性
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| 关 键 词： | 纳米球蚀刻技术 Au纳米颗粒 三阶光学非线性 |
| 收稿时间： | 6/1/2010 12:00:00 AM |
The two-photon absorption saturation process in an Au nanoparticle array |
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| Wang Kai,Long Hua,Fu Ming,Zhang Li-Chao,Yang Guang,Lu Pei-Xiang.The two-photon absorption saturation process in an Au nanoparticle array[J].Acta Physica Sinica,2011,60(3):34209-034209. |
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| Authors: | Wang Kai Long Hua Fu Ming Zhang Li-Chao Yang Guang Lu Pei-Xiang |
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| Institution: | Wuhan National Laboratory for Optoelectronics Division of Laser Science and Technology, Huazhong University of Science and Technology, Wuhan 430074,China;Wuhan National Laboratory for Optoelectronics Division of Laser Science and Technology, Huazhong University of Science and Technology, Wuhan 430074,China;Wuhan National Laboratory for Optoelectronics Division of Laser Science and Technology, Huazhong University of Science and Technology, Wuhan 430074,China;Wuhan National Laboratory for Optoelectronics Division of Laser Science and Technology, Huazhong University of Science and Technology, Wuhan 430074,China;Wuhan National Laboratory for Optoelectronics Division of Laser Science and Technology, Huazhong University of Science and Technology, Wuhan 430074,China;Wuhan National Laboratory for Optoelectronics Division of Laser Science and Technology, Huazhong University of Science and Technology, Wuhan 430074,China |
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| Abstract: | The triangular Au nanoparticle array of size 37 nm was fabricated on a quartz substrate using nanosphere lithography. By performing the Z-scan method with femtosecond laser (800 nm, 50 fs), the optical nonlinearity of the Au nanoparticle array was determined. The results showed an intensity-related two-photon absorption saturation processes. As the excitation intensity increases, the nonlinear absorption changes from two-photon absorption to saturated absorption, while the nonlinear refraction exhibits self-defocusing effect. The one- and two-photon figures of merit, W=7.5 and T=0.12, were obtained, validating a high efficiency nonlinear material for all-optical switching. |
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| Keywords: | nanosphere lithography Au metal nanoparticles third-order nonlinearity |
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